Once sold by tacky ads in the back of magazines, cellulite treatments have rocketed to best-seller status on prestige beauty counters. Last April, for example, Burdines in Miami sold 346 bottles of Biotherm Cellulite Smoothing Concentrate in just one week; in one yeai; Christian Dior Svelte Cellulite Control Complex raked in $14 million nationwide-a large slice of that from repeat sales. Though most labels are careful to tout only cosmetic benefits, women’s hopes are often much higher; so we wanted to find out exactly what you could expect for your money. With help from Gary Grove, Ph.D., skin physiologist at the Skin Study Center in Broomall, Pa., we designed a study that put six products-with various prices and ingredients-to the test.